Mobile telephone with inertial sensor

ABSTRACT

At least one inertial sensor is configured to sense movement of a mobile telephone. Information derived at least in part from data output by the inertial sensor related to the movement of the mobile telephone is used as an input to a user interface implemented by software executing on the mobile telephone.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. application Ser. No.12/730,778, filed on Mar. 24, 2010, which is a continuation of U.S.application Ser. No. 10/973,503, filed on Oct. 26, 2004. Both U.S.application Ser. Nos. 12/730,778 and 10/973,503 are hereby incorporatedherein by reference.

BACKGROUND

Navigation systems are typically used to provide information indicativeof position and/or movement. For example, in one exemplary navigationsystem, one or more inertial sensors are used to generate informationindicative of movement. Examples of such inertial sensors includegyroscopes and accelerometers. In one such navigation system, one ormore magnetic sensors are also used to generate information indicativeof direction. An example of such a magnetic sensor is a magnetometer. Inone such navigation system, one or more barometric pressure sensors arealso used to generate information indicative of altitude. Theinformation generated by such sensors is processed to provide positionaland/or movement information.

In one application, a navigation system is used to generate informationindicative of the position and/or motion of a particular human. However,in applications where the sensors are subject to a wide and/orunpredictable range of human movements, the complexity of navigationalalgorithms and/or the quality of the sensors used in such an applicationtypically must be increased in order to handle and/or compensate forsuch movements and still provide the desired navigational information.This can increase the cost and/or size of such a system.

SUMMARY

One exemplary embodiment is directed to a mobile telephone comprising atleast one inertial sensor configured to sense movement of the mobiletelephone and at least one programmable processor configured to executesoftware. The at least one programmable processor is communicativelycoupled to the inertial sensor. The software is configured to useinformation derived at least in part from data output by the inertialsensor related to the movement of the mobile telephone as an input to auser interface implemented by the software on the mobile telephone.

Another exemplary embodiment is directed to a method comprising sensingmovement of a mobile telephone at least in part using an inertial sensorand providing information derived at least in part from sensor dataoutput by the inertial sensor to at least one programmable processorincluded in the mobile telephone. The method further comprises using atleast some of the information provided to the programmable processor asan input to software executing on the programmable processor included inthe mobile telephone and using the information derived at least in partfrom the data output by the inertial sensor as an input to a userinterface implemented by the software on the mobile telephone.

DRAWINGS

FIG. 1 is a schematic diagram of one usage scenario of a human using anavigation unit and a portable digital device.

FIG. 2 is a schematic diagram of another usage scenario of a human usinga navigation unit and a portable digital device.

FIG. 3 is a block diagram of one embodiment of the system shown in FIG.1.

FIG. 4 is a flow diagram of one embodiment of a method of communicatingdata between a navigation unit and a portable device.

FIG. 5 is a flow diagram of one embodiment of a method of communicatingdata between a navigation unit and a portable device.

Like reference numbers and designations in the various drawings indicatelike elements.

DETAILED DESCRIPTION

FIG. 1 is a schematic diagram of a human 100 (also referred to here asthe “user” 100) using an embodiment of system 101 that includes anavigation unit 102 and a portable device 104. FIG. 1 illustrates oneusage scenario for the navigation unit 102. As used herein, a “portabledevice 104” is a device that is typically held in a hand 106 of the user100 when the user 100 uses or otherwise interacts with the portabledevice 104. Examples of portable devices 104 include a mobile telephone,two-way radio, palmtop computer, personal digital assistant, musicand/or video player (for example, a MP3, CD, or DVD player), andhand-held game device. In the embodiment shown in FIG. 1, the navigationunit 102 and the portable device 104 communicate with one another over awireless communication link 108. The communication between thenavigation unit 102 and the portable device 104 over the wirelesscommunication link 108 occurs when the navigation unit 102 and theportable device 104 are both used by the user 100. That is, suchcommunication occurs when the navigation unit 102 and the portabledevice 104 are physically close to each other.

In the usage scenario shown in FIG. 1, the navigation unit 102 isattached to the torso 110 of the user 100. For example, as shown in FIG.1, the navigation unit 102 is attached to a belt 112 worn by the user100. In one implementation, the navigation unit 102 (or a carrying case(not shown) for the navigation unit 102) includes a clip or otherattachment mechanism that allows the navigation unit 102 to be removablyattached to the belt 112.

Such an embodiment is suitable for use, for example, in applicationswhere it is desirable to monitor the movement of the user 100. Theportable device 104 is typically subject to a wide and/or unpredictablerange of movements. By separating the navigation unit 102 from theportable device 104 and mounting the navigation unit 102 on the torso110 of the user 100, the navigation unit 102 need not be designed tohandle and/or compensate for such a wide and/or unpredictable range ofmovements of the portable device 104 in order to monitor the movement ofthe user 100. Thus, smaller, less expensive and/or less complex sensorsand/or algorithms can be used in the navigation unit 102 in such anembodiment. The use of such sensors and/or algorithms can reduce thecost, complexity, and/or size of the navigation unit 102.

Moreover, though the device 104 is shown in FIG. 1 being held in thehand 106 of the user 100, it is to be understood that the portabledevice 104 is not always held in the user's hand 106. For example, inthe embodiment shown in FIG. 1, the user 100 can attach the portabledevice 104 to the belt 112 of the user 100 when the user 100 is notholding the portable device 104 in one of the user's hands 106. Theportable device 104 (or a carrying case (not shown) for the portabledevice 104) in such an embodiment includes a belt clip (not shown) orother attachment mechanism that is used to removably attach the portabledevice 104 to the belt 112. The portable device 104 is removed from thebelt 112 when the user 100 wishes to actively interact with the portabledevice 104. For example, where the portable device 104 comprises amobile telephone, the mobile telephone is removed from the belt 112 whenthe user 100 wishes to engage in a telephone call using the mobiletelephone.

FIG. 2 is a schematic diagram of another usage scenario for thenavigation unit 102. The navigation unit 102 in this usage scenario isphysically coupled to the portable device 104. For example, in oneimplementation, the navigation unit 102 is removably coupled to theportable device 104 using a clip or other attachment mechanism thatallows the navigation unit 102 to be physically attached to the portableunit 104 so that the navigation unit 102 and the portable device 104 canbe held and moved by the user 100 together.

Such an embodiment is suitable for use, for example, in applicationswhere it is desirable to monitor the movement of the portable device 104as opposed to the user 100. For example, in one such application, thenavigation unit 102 and the portable device 104 act as an input devicefor a video game (for example, where the portable device 104 andnavigation unit 102 are moved like a steering wheel of an automobile orlike a joystick). In another application, the navigation unit 102 andthe portable device 104 act as an input device for a user interfaceexecuting on the portable device 104 (for example, where the portabledevice 104 and the navigation unit 102 are used as a pointing devicesuch as a mouse). In the embodiment shown in FIG. 2, the navigation unit102 and the portable device 104 communicate with one another over awireless communication link 108, as is done in the usage scenario shownin FIG. 1.

In applications where the navigation unit 102 need only identify afinite number of gestures or movements and/or with only a relativelymodest degree of accuracy, smaller, less expensive and/or less complexsensors and/or algorithms (for example, the same sensors and/oralgorithms that are suitable for use in the usage scenario shown inFIG. 1) can be used in the navigation unit 102. The use of such sensorsand/or algorithms can reduce the cost, complexity, and/or size of thenavigation unit 102.

In the usage scenario shown in FIG. 2, the navigation unit 102 can beremoved from the portable device 104 and, for example, mounted to thetorso 110 of the user 100 as shown in FIG. 1 in order to monitor themovement of the user 100 as opposed to the portable device 104.Likewise, in the usage scenario shown in FIG. 1, the navigation unit 102can be removed from the torso 110 of the user 100 and, for example,mounted to the portable device 104 as shown in FIG. 2 in order tomonitor the movement of the portable device 104.

FIG. 3 is a block diagram of one embodiment of the system 101 shown inFIG. 1. The navigation unit 102 includes a sensor subsystem 302 thatincludes one or more sensors 304. The sensors 304 generate information(for example, in the form of one or more analog signals or one or moredigital data streams) that are indicative of a position and/or movementof the navigation unit 102. In the embodiment shown in FIG. 3, thesensors 304 include one or more inertial sensors 306, one or moremagnetic sensors 308, and/or one or more barometric pressure sensors309. In one implementation of such an embodiment, one or more of thesensors 304 are implemented using micro-electro-mechanical systems(MEMS) sensors. The data output by the sensors 304 are processed by aprocessing unit 310. In the embodiment shown in FIG. 3, the processingunit 310 is implemented using at least one programmable processor 312(for example, at least one microprocessor) that is programmed withsuitable program instructions 314. In such an embodiment, the processingunit 310 includes a memory 316 (for example, any suitable form ofvolatile memory and/or non-volatile memory) for storing such programinstructions 314 and/or data structures 318 used during execution of theprogram instructions 314.

In the embodiment of system 101 shown in FIG. 3, the navigation unit 102also includes a wireless interface 320. The wireless interface 320 iscoupled to the processing unit 310 and is used by the processing unit310 to communicate with the portable device 104 over the communicationlink 108. In one embodiment, the wireless communication link 108 isimplemented using a low-power, short-range wireless communication linkthat makes use of, for example, BLUETOOTH® wireless technology. In suchan embodiment, the wireless interface 320 includes a suitable BLUETOOTHwireless transceiver 322 that sends and receives data over the wirelesscommunication link 108. In other embodiments, other types of wirelesscommunication links 108 are used.

In the embodiment of system 101 shown in FIG. 3, the navigation unit 102also includes an attachment interface 380. In one implementation, theattachment interface 380 comprises a clip or other attachment mechanismthat is used to attach the navigation unit 102 to the user 100 (or to anitem of clothing worn by the user such as a belt) and/or to the portabledevice 104. In other embodiments, the navigation unit 102 does notinclude the attachment interface 380 and instead the navigation unit 102is put into a carrying case (not shown) that includes an attachmentinterface.

An exemplary embodiment of a portable device 104 is also shown in FIG.3. The portable device 104 shown in FIG. 3 includes an input interface332 and an output interface 334. The particular type of input interface332 and output interface 334 used in the portable device 104 variesdepending on the particular type of portable device 104 that is used.For example, where the portable device 104 comprises a mobile telephone,the input interface 332 includes a keypad 336 on which a user 100 isable to press various keys to input alphanumeric data. Also, in such amobile telephone embodiment, the input interface 332 also includes amicrophone 338 into which sound input is supplied to the portable device104. In one implementation, a user speaks various voice commands thatare recognized by the portable device 104.

In such a mobile telephone embodiment, the output interface 334 includesa display 340 (for example, a liquid crystal display (LCD)) on whichinformation is displayed for the user 100. In one implementation of suchan embodiment, a user interface is displayed on the display 340 in orderto display information for the user and to prompt the user to supplycertain inputs. In some embodiments (for example, where the portabledevice 104 comprises a personal digital assistant (PDA) or palmtopcomputer), the input interface 332 includes a touch screen 342 that iscoupled to the display 340 of the output interface 334 (for example, bybeing overlaid on the display 340). Also, in a mobile telephoneembodiment, the output interface 334 includes a speaker 344 thatgenerates audio signals for the user 100 to hear. For example, in oneimplementation of such an embodiment, information is provided to theuser 100 (or the user 100 is prompted to supply input) by playing, forexample, a voice on the speaker 344 for the user 100.

A processing unit 346 is included in the portable device 104. Theprocessing unit 346 is used to control and/or implement at least aportion of the functionality described here as being performed by theportable device 104. In the embodiment shown in FIG. 3, the processingunit 346 is implemented using at least one programmable processor 348(for example, at least one microprocessor) that is programmed withsuitable program instructions 350. In such an embodiment, the processingunit 346 of the portable device 104 includes a memory 352 (for example,any suitable form of volatile memory and/or non-volatile memory) forstoring such program instructions 350 and/or data structures 354 usedduring execution of the program instructions 350.

The portable device 104 also includes a wireless interface 356. Thewireless interface 356 is coupled to the processing unit 346 of theportable device 104 and is used by the processing unit 346 tocommunicate with the navigation unit 102 over the communication link108. In one embodiment where the wireless communication link 108 isimplemented using BLUETOOTH® wireless technology, the wireless interface356 includes a suitable BLUETOOTH wireless transceiver 358 that sendsand receives data over the wireless communication link 108. In otherembodiments, other types of wireless communication links 108 are used.

In the embodiment of system 101 shown in FIG. 3, the portable device 104also includes an attachment interface 382. In one implementation, theattachment interface 382 comprises a clip or other attachment mechanismthat is used to attach the portable device 104 to the user 100 (or to anitem of clothing worn by the user such as a belt) and/or to thenavigation unit 102. In other embodiments, the portable device 104 doesnot include the attachment interface 382 and instead the portable device104 is put into a carrying case (not shown) that includes an attachmentinterface. For example in one embodiment, the navigation unit 102 isincorporated into a “holster” or other carrying case for the portabledevice 104. When the user 100 is not actively using the portable device104, the user 100 inserts the portable device 104 into the holster thatcontains the navigation unit 102.

In the embodiment shown in FIG. 3, each of the navigation unit 102 andthe portable device 104 include separate power sources 360 and 362,respectively. For example, in such an embodiment, each of the powersources 360 and 362 comprises one or more batteries. In otherembodiments, power sources 360 and/or 362 comprise other types of powersources. By including a separate power source 360 in the navigation unit102, the navigation unit 102 need not be provided power from anothersource external to the navigation unit 102 (for example, from theportable device 104).

In the embodiment shown in FIG. 3, in addition to inertial sensors 306,magnetic sensors 308 and barometric pressure sensors 309, othermechanisms are used to obtain navigation-related information. Inparticular, in the embodiment shown in FIG. 3, the sensors 304 include aradio frequency (RF) sensor 370. The RF sensor 370 detects whether aradio frequency transponder (not shown) is within a detection range ofthe RF sensor 370. In one implementation, the RF sensor 370 comprises aRF transponder reader that, when a RF transponder (not shown) is placedwithin the detection range of the RF transponder reader, receivesinformation from the RF transponder. In such an implementation, theinformation that is received from the RF transponder includesinformation that is associated with a particular geographic location.The information received from such a RF transponder is processed by theprocessing unit 310 to determine a geographic position estimate. Such ageographic position estimate is then used in the navigation-relatedprocessing performed by the processing unit 310 (for example, to controlthe navigation error growth).

For example, in one application a particular RF transponder is locatedat a specific geographic location (for example, a room within abuilding). When the navigation unit 102 is positioned so that the RFtransponder is within the detection range of the RF sensor 370, the RFtransponder communicates information from the RF transponder to the RFsensor 370. In one implementation, the information that is communicatedfrom the RF transponder to the RF sensor 370 includes the geographicposition of the RF transponder. That is, information directlyidentifying the geographic position of the RF transponder is encodedinto the information communicated from the RF transponder to the RFsensor 370. In another implementation, the information that iscommunicated from the RF transponder to the RF sensor 370 includes aserial number or other identifier of the RF transponder. The processingunit 310, in such an implementation, is able to associate that serialnumber with a particular geographic location (for example, by using alook-up table or other data structure 318 stored in memory 316). In suchimplementations, the processing unit 310 concludes that the navigationunit 102 is near the geographic position associated with that RFtransponder.

Also, in the embodiment shown in FIG. 3, the navigation unit 102 usesglobal position system (GPS) information in the navigation-relatedprocessing performed by the processing unit 310. In the embodiment shownin FIG. 3, the navigation unit 102 and/or the portable device 104includes a GPS receiver. For example, the portable device 104, in oneembodiment, includes a GPS receiver 364 that is used to receive signalstransmitted by GPS satellites (typically, from at least four GPSsatellites). In operation, the distance from each of the GPS satellitesto the GPS receiver 364 is determined by estimating the amount of timeit takes each signal transmitted by each of the GPS satellites to reachthe GPS receiver 364. The distance estimates are then used to calculatethe position of the GPS receiver 364. In one such embodiment, such GPSinformation is communicated from the portable device 104 to thenavigation unit 102 over the wireless communication link 108. The GPSinformation is received by the navigation unit 102 from the portabledevice 104 and is used by the processing unit 310 in thenavigation-related processing performed by the processing unit 310. Forexample, the processing unit 310 in one embodiment uses the GPSinformation to control navigation error growth.

In another embodiment, the navigation unit 102 includes a GPS receiver366 within the navigation unit 102 itself instead of, or in addition to,the GPS receiver 364 within the portable device 102. In such anembodiment, the GPS information generated by the GPS receiver 366 isused by the processing unit 310 in the navigation-related processingperformed by the processing unit 310. For example, the processing unit310 in one embodiment uses the GPS information to control navigationerror growth.

Also, in the embodiment shown in FIG. 3, the navigation unit 102 usestime difference of arrival (TDOA) or time of arrival (TOA) informationin the navigation-related processing performed by the processing unit310. In the embodiment shown in FIG. 3, the portable device 104 includesa TDOA/TOA interface 386 by which the portable device 104 receives aTDOA or TOA position estimate. In operation, the portable device 104transmits data to two or more base stations (for example, using atransceiver (not shown) included in the TDOA/TOA interface 386). Thebase stations determine, in this example, a position estimate for theportable device 104 based on the differences in the time at which suchtransmission arrive at each of the base stations. The position estimateis communicated to the portable device 104 and the portable device 104communicates the received TDOA position estimate to the navigation unit102 over the wireless communication link 108. The TDOA position estimateis received by the navigation unit 102 from the portable device 104 andis used by the processing unit 310 in the navigation-related processingperformed by the processing unit 310. For example, the processing unit310 in one embodiment uses the TDOA position estimate to controlnavigation error growth. In other implementations, TOA techniques areused in addition to or instead of TDOA techniques to generate a positionestimate.

Moreover, as shown in FIG. 3, the navigation unit 102 can include aTDOA/TOA interface 387 in addition to, or instead of, the TDOA/TOAinterface 386 included in the personal device 104. The TDOA/TOAinterface 387 is used to generate a TDOA or TOA position estimate asdescribed above in connection with the TDOA/TOA interface 386. In oneimplementation, the RF sensor 370 is implemented as a TDOA/TOA sensorfor use with or in the TDOA/TOA interface 387. Such a position estimateis then used by the processing unit 310 in the navigation-relatedprocessing performed by the processing unit 310.

In another implementation, the TDOA/TOA interface 387 is used togenerate individual TDOA or TOA range and/or range rate estimates toindividual TDOA/TOA base station(s) as described above in connectionwith the TDOA/TOA interface 386. The range and/or range rate estimate(s)are then used by the processing unit 310 in the navigation-relatedprocessing performed by the processing unit 310. This implementationallows useful navigation data to be derived from the TDOA/TOA even whena complete position estimate cannot be performed by the TDOA/TOA due tolack of base station coverage.

In one exemplary embodiment, the sensors 304 are used to determine aposition of the user 100 of the system 101. In such an embodiment,inertial sensors 306 are used to determine a first position estimate.The sensors 304 and/or the GPS receiver 364 or 366 are also used todetermine a second position estimate and/or an estimate of distancetraveled by the user 100. The second position estimate and/or distancetraveled estimate are used to determine corrections to the firstposition estimate.

For example, in one implementation of such an exemplary embodiment, theprocessing unit 310 generates the first position estimate from signalsoutput from inertial sensors 306. In such an implementation, theinertial sensors 306 include an arrangement of three accelerometers andthree gyroscopes that are used to generate the first position estimate.Accelerometers are inertial sensors 306 that sense a linear change inrate (that is, acceleration) along a given axis. Gyroscopes are inertialsensors 306 that sense angular rate (that is, rotational velocity). Thethree accelerometers are oriented around three mutually orthogonal axes(the x, y, and z axes) and the three gyroscopes are oriented aroundthree mutually orthogonal axes (pitch, yaw, and roll axes). The outputsof the accelerometers and the gyroscopes are processed by the processingunit 310 (for example, using program instructions 314 executing on theprogrammable processor 312 of the processing unit 310). For example, thethree orthogonal outputs of the accelerometers are vectorily summed bythe processing unit 310 to obtain an acceleration vector for thenavigation unit 102. The processing unit 310 integrates the accelerationvector to obtain a velocity vector for the navigation unit 102 and thenintegrates the velocity vector to obtain a position vector for thenavigation unit 102. The three orthogonal outputs of the gyroscopes arevectorily summed by the processing unit 310 to obtain a rotationalvelocity vector for the navigation unit 102. The processing unit 310integrates the rotational velocity vector to obtain the attitude of thenavigational unit 102. The position vector and the attitude are used togenerate the first position estimate. In another implementation, asecond position estimate of altitude is generated using the barometricpressure sensor 309.

In one implementation of such an exemplary embodiment, the processingunit 310 generates the second position estimate and/or distance traveledestimate using a motion classifier and one or more motion models. Insuch an implementation, the motion classifier and motion models areimplemented, for example, in software using appropriate programinstructions 314 executing on the programmable processor 312 of theprocessing unit 310. The motion classifier and motion models are used togenerate the second position estimate and/or distance traveled estimatefrom the signals output by the sensors 304. In another implementation,the second position estimate and/or distance traveled estimate isgenerated using dead reckoning techniques, GPS information, TDOAinformation, and/or information received from one or more RFtransponders.

In one implementation of such an exemplary embodiment, the processingunit 310 generates the corrections to the first position estimate usinga Kalman filter. In such an implementation, the Kalman filter isimplemented, for example, in software using appropriate programinstructions executing on the programmable processor 312 of theprocessing unit 310. The Kalman filter receives the first positionestimate and the second position estimate and/or distance traveledestimate and generates corrective feedback for the first positionestimate.

Such an exemplary embodiment is described in U.S. Pat. No. 6,522,266,entitled “Navigation System, Method and Software for Foot Travel,”(referred to here as the “266 Patent”). The '266 Patent is herebyincorporated herein by reference.

In another exemplary embodiment, the navigation unit 102 is used tosense and measure the motion of the user 100 to which the navigationunit 102 is attached. The navigation unit 102 classifies the motion ofthe user 100 and determines the amount of energy expended by the user100 as a result of the motion. The sensors 304 include sensors (forexample, sensors 306 and 308) for measuring position and/or distancetraveled. In such an embodiment, the sensors 304 also include at leastone physiological sensor 372 that senses or measures informationindicative of at least one physiological attribute of the user 100 suchas respiration rate, heart rate, hydration level, and/or blood oxygenlevel before, during, and/or after such motion. Such an exemplaryembodiment is described in co-pending U.S. patent application Ser. No.10/634,931, entitled “Human Motion Identification and Measurement Systemand Method” and filed on Aug. 5, 2003 (the “'931 Application”). The '931Application is hereby incorporated herein by reference.

FIG. 4 is a flow diagram of one embodiment of a method 400 ofcommunicating data between a navigation unit and a portable device. Theembodiment shown in FIG. 4 is described here as being implemented usingthe system 101 shown in FIGS. 1-3, though other embodiments areimplemented in other ways (for example, using other navigation unitsand/or portable devices).

Method 400 includes receiving an input for the navigation unit 102(referred to here as “navigation-related input”) at the portable device104 (block 402). One example of a navigation-related input is input thatis supplied to the portable device 104 by the user 100 via the inputinterface 332 of the portable device 104. For example, in an embodimentwhere the portable device 104 comprises a mobile telephone, a user usesa keypad 336 to enter the navigation-related input on the keypad 336and/or speaks a voice command into a microphone 338 that is recognized,for example, by voice recognition software executing on the processingunit 346 of the portable device 104. In other embodiments, thenavigation-related input is supplied using other parts of the inputinterface 332.

In some situations, the portable device 104, via the output interface344, prompts the user 100 to supply such navigation-related input. Forexample, in one embodiment, the portable device 104 prompts the user 100by displaying a prompt on a display 340 (for example, as a part of auser interface). In another embodiment, the portable device 104 promptsthe user 100 by playing an audible cue on a speaker 344 (for example, byplaying a voice instructing the user 100 to supply a certain type ofnavigation-related input). In other situations, the user 100 suppliesthe navigation-related input to the portable device 100 without firstbeing prompted by the portable device 104. For example, in one suchsituation, the user 100 provides a system command to the navigation unit102 (for example, to change some operational aspect of the navigationunit 102).

One type of navigation-related input includes system or other types ofcommands that modify the operation of the navigation unit 102. Forexample, in one embodiment, the user 100 causes the navigation unit 102to power on or power off by entering a power on or power off command,respectively.

Another type of navigation-related input includes navigation informationthat is used in the navigation processing performed by the navigationunit 102. For example, in an embodiment where the navigation unit 102performs dead reckoning navigation processing, the user 100 supplies aninput that is indicative of a known starting position of the user 100that serves as the basis for the dead reckoning processing performed bythe navigation unit 102.

Another type of navigation-related input includes information about theuser 100. For example, in an embodiment where the navigation unit 102estimates an amount of energy expended by the user 100 in performingsome motion such as walking, the user 100 enters the user's weight andage, which are used by the processing unit 310 in such an embodiment toestimate the amount of energy expended by the user 100 in performing themotion. Another example of such navigation-related input includes anaverage stride length for the user 100 that is used in dead reckoningnavigation processing performed by the navigation unit 102.

Another type of navigation-related input is GPS information that isreceived by a GPS receiver 364 of the portable device 104. For example,in one embodiment, the GPS receiver 364 of the portable device 104receive signals transmitted by four GPS satellites. The distance fromeach of the GPS satellites to the GPS receiver 364 is determined byestimating the amount of time it takes each signal transmitted by eachof the GPS satellites to reach the GPS receiver 364. The distanceestimates are then used to calculate the position of the GPS receiver364. This GPS position information is then communicated to thenavigation unit 102 as described below.

Another type of navigation-related input is TDOA information that isreceived by a TDOA interface 386 of the portable device 104. For examplein one embodiment, the TDOA information includes a TDOA positionestimate determined based on the time difference of arrival of atransmission from the portable device 104 to multiple base stations. TheTDOA information is then communicated to the navigation unit 102 asdescribed below.

Method 400 also includes transmitting the navigation-related input fromthe portable device 104 to the navigation unit 102 over the wirelesscommunication link 108 (block 404). The navigation-related input isreceived by the navigation unit 102 (block 406). For example, thenavigation-related input is transmitted by the wireless transceiver 358of portable device 104 to the wireless transceiver 322 of the navigationunit 102 over the wireless communication link 108 using BLUETOOTHtechnology. The transmitted navigation-related input is received by thewireless transceiver 322 in the navigation unit 102 and is supplied tothe processing unit 310 for use thereby. In other embodiments, otherwireless communication technology is used.

In one embodiment, the navigation-related input is checked for errorsand/or other conditions by the portable device 104 prior tocommunicating the navigation-related input to the navigation unit 102.For example, where a user 100 supplies navigation-related input to theportable device 104 using the input interface 332 (for example, byentering such input using keypad 336), if the user 100 makes a dataentry error (for example, by entering alphabetic data where numeric datais expected or required), an error message is displayed for the user 100via the output interface 334 (for example, by displaying such a messageon the display 340) prompting the user 100 to supply corrected input. Inthis way, navigation-related input containing an error need not becommunicated between the portable device 104 and the navigation unit102. As a result, the navigation unit 102 need not perform the checkingperformed by the portable device 104.

In other embodiments, such checking is performed by the navigation unit102 after the navigation-related input has been communicated from theportable device 104 to the navigation unit 102 over the wirelesscommunication link 108. In one implementation of such an embodiment,when the navigation unit 102 determines that the receivednavigation-related input contains an error (or when some other conditionexists), the navigation unit 102 communicates this fact to the portabledevice 104 (for example, by sending an error message to the portabledevice 104 over the wireless communication link 108). When the portabledevice 104 receives such a communication, the portable device 104informs the user 100 that the navigation-related input contained anerror (for example, by displaying a suitable error message on thedisplay 340). In this way, the input processing functionality of theportable device 104 can be simplified.

In other embodiments, input checking is performed both by the portabledevice 104 prior to communication of the navigation-related input to thenavigation unit 102 and by the navigation unit 102 after thenavigation-related input is received at the navigation unit 102.

Method 400 also includes using at least a portion of the receivednavigation-related input in the processing performed by the navigationunit 102 (block 408). For example, where the navigation-related inputincludes system or other types of commands that modify the operation ofthe navigation unit 102, the navigation unit 102 carries out the commandincluded in the navigation-related input and modifies the operation ofthe navigation unit 102 accordingly.

In an embodiment where the navigation unit 102 performs dead reckoningnavigation processing and the navigation-related input includes a knownstarting position of the user 100, the known starting position is usedin the dead reckoning navigation processing performed by the navigationunit 102.

In an embodiment where the navigation unit 102 estimates an amount ofenergy expended by the user 100 in performing some motion such aswalking and the navigation-related input includes the weight and age ofthe user 100, the processing unit 310 uses the weight and ageinformation to estimate the amount of energy expended by the user 100 inperforming the motion.

In an embodiment where the navigation-related input includes GPS or TDOAinformation (for example, a position estimate determined based on GPSsignals received at the portable device 104 or a TDOA positionestimate), the GPS or TDOA information is used by the processing unit310, for example, to limit the growth of errors in position and/ormotion estimates based on the outputs of the inertial sensors 306.

FIG. 5 is a flow diagram of one embodiment of a method 500 ofcommunicating data between a navigation unit and a portable device. Theembodiment shown in FIG. 5 is described here as being implemented usingthe system 101 shown in FIGS. 1-3, though other embodiments areimplemented in other ways (for example, using other navigation unitsand/or portable devices).

Method 500 includes generating output at the navigation unit 102 (block502). This output is also referred to here as “navigation-relatedoutput.” In one embodiment, the navigation-related output is generatedby the processing unit 310 of the navigation unit 102. In such anembodiment, the processing unit 310 generates the navigation-relatedoutput based on, for example, signals output by the sensors 304 and/orthe GPS receiver 366 and/or navigation-related input received from theportable unit 104 (for example, a navigation-related input such as astarting position estimate or GPS or TDOA information received from theGPS receiver 364 or TDOA interface 386, respectively, of the portabledevice 104).

One example of a navigation-related output is a position estimate thatis determined by the navigation unit 102 using signals output by one ormore of the sensors 304. Another example of navigation-related output isan estimate of an attribute related to motion of the user (for example,the distance traveled, velocity, acceleration, etc.). Examples of suchoutput are described in the '266 Patent. Other examples ofnavigation-related output include an estimate or measured physiologicalattribute of the user 100 to which the navigation unit 102 is attached(for example, energy expended, respiration rate, heart rate, hydrationlevel, blood oxygen level). Examples of such physiological output aredescribed in the '931 Application.

Method 500 includes transmitting the navigation-related output from thenavigation unit 102 to the portable device 104 over the wirelesscommunication link 108 (block 504). The navigation-related output isreceived by the portable device 104 (block 506). For example, thenavigation-related output is transmitted by the wireless transceiver 322of the navigation unit 102 to the wireless transceiver 358 of portabledevice 104 over the wireless communication link 108 using BLUETOOTHtechnology. In other embodiments, other wireless communicationtechnology is used. The transmitted navigation-related output isreceived by the wireless transceiver 358 in the portable device 104.

The received navigation-related output is used by the portable device104 (block 508). For example, in one embodiment, the receivednavigation-related output is supplied to the processing unit 346 of theportable device 104 for use thereby. For example in one implementation(shown in FIG. 5 using dashed lines), the use of the navigation-relatedoutput includes outputting at least a portion of the navigation-relatedoutput at the portable device 104 for the user 100 (block 510). In oneusage scenario, information (for example, a position estimate) includedin the navigation-related output is displayed on a display 340 of theportable device 104 for the user 100 to read. In such a usage scenario,the navigation-related output is displayed within a user interface thatis otherwise displayed on display 340. Also, in some situations, thenavigation-related output is displayed in connection with a prompt orother request for the user 100 to enter some form of input in responseto the displayed output.

In another usage scenario, the information included in thenavigation-related output is used to generate an audio signal that isplayed by the speaker 344 included in the output interface 334 of theportable device 104. For example, in one implementation of such anembodiment, information included in the navigation-related output isoutput in the form of a voice that speaks at least some of theinformation included (or information that is derived from at least someof) the navigation-related output. In another implementation, aparticular audio cue is played on the speaker 342 depending on thecontent of the navigation-related output (for example, a warning beepmay be played if the user 100 has strayed from a particular course or aphysiological attribute of the user 100 meets some condition).

In one embodiment, information included in the navigation-related outputis formatted or otherwise modified prior to being output by the portabledevice 104. In one example where the navigation-related output includesa position estimate, the processing unit 346 of the portable device 104converts the units of measure in which the position estimate isexpressed to units that are preferred by the user 100 (for example, frommetric units to English/U.S. units).

In another embodiment, the received navigation-related output is used bythe portable device 104 as an input for other processing performed bythe portable device 104. For example in the usage scenario shown in FIG.2, the navigation unit 102 and the portable device 104 act as an inputdevice, for example, for a video game or a user interface executing onthe portable device 104. The navigation-related output received by theportable device 104 is supplied to the video game or user interface forprocessing thereby.

The methods and techniques described here may be implemented in digitalelectronic circuitry, or with a programmable processor (for example, aspecial-purpose processor or a general-purpose processor such as amicroprocessor) firmware, software, or in combinations of them.Apparatus embodying these techniques may include appropriate input andoutput devices, a programmable processor, and a storage medium tangiblyembodying program instructions for execution by the programmableprocessor. A process embodying these techniques may be performed by aprogrammable processor executing a program of instructions to performdesired functions by operating on input data and generating appropriateoutput. The techniques may advantageously be implemented in one or moreprograms that are executable on a programmable system including at leastone programmable processor coupled to receive data and instructionsfrom, and to transmit data and instructions to, a data storage system,at least one input device, and at least one output device. Generally, aprocessor will receive instructions and data from a read-only memoryand/or a random access memory. Storage devices suitable for tangiblyembodying computer program instructions and data include all forms ofnon-volatile memory, including by way of example semiconductor memorydevices, such as EPROM, EEPROM, and flash memory devices; magnetic diskssuch as internal hard disks and removable disks; magneto-optical disks;and DVD disks. Any of the foregoing may be supplemented by, orincorporated in, specially-designed application-specific integratedcircuits (ASICs).

A number of embodiments of the invention defined by the following claimshave been described. Nevertheless, it will be understood that variousmodifications to the described embodiments may be made without departingfrom the spirit and scope of the claimed invention. Accordingly, otherembodiments are within the scope of the following claims.

1. A mobile telephone comprising: at least one inertial sensor configured to sense movement of the mobile telephone; and at least one programmable processor configured to execute software, the at least one programmable processor communicatively coupled to the inertial sensor; wherein the software is configured to use information derived at least in part from data output by the inertial sensor related to the movement of the mobile telephone as an input to a user interface implemented by the software on the mobile telephone.
 2. The mobile telephone of claim 1, wherein the inertial sensor comprises at least one of: an accelerometer; and a gyroscope.
 3. The mobile telephone of claim 1, wherein the information derived at least in part from the data output by the inertial sensor related to the movement of the mobile telephone comprises information indicative of at least one of an attitude of the mobile telephone, a velocity of the mobile telephone, and an acceleration of the mobile telephone.
 4. The mobile telephone of claim 1, wherein the inertial sensor is attached to the mobile telephone.
 5. The mobile telephone of claim 1 further comprising at least one of: a display, a speaker, a key pad, a microphone, and a touch screen.
 6. The mobile telephone of claim 1 further comprising at least one of a magnetic sensor, a barometric pressure sensor, a radio frequency sensor, a physiological sensor, a global position system receiver, a time difference of arrival interface, and a time of arrival interface.
 7. A method comprising: sensing movement of a mobile telephone at least in part using an inertial sensor; providing information derived at least in part from sensor data output by the inertial sensor to at least one programmable processor included in the mobile telephone; and using at least some of the information provided to the programmable processor as an input to software executing on the programmable processor included in the mobile telephone; and using the information derived at least in part from the data output by the inertial sensor as an input to a user interface implemented by the software on the mobile telephone.
 8. The method of claim 7, wherein the inertial sensor comprises at least one of: an accelerometer; and a gyroscope.
 9. The method of claim 7, wherein information derived at least in part from the sensor data output by the inertial sensor comprises information indicative of at least one of an attitude of the mobile telephone, a velocity of the mobile telephone, and an acceleration of the mobile telephone.
 10. A program product for use with a mobile telephone having an inertial sensor attached thereto, the program product comprising a non-transitory processor-readable medium on which program instructions are embodied, wherein the program instructions are operable, when executed by at least one programmable processor included in the mobile telephone, to cause the mobile telephone to: obtain information derived from sensor data output by the inertial sensor; use at least some of the information derived from the sensor data output by the inertial sensor as an input for the program product; and use the information derived at least in part from the data output by the inertial sensor as an input to a user interface on the mobile telephone.
 11. The program product of claim 10, wherein the information derived from the sensor data output by the inertial sensor is indicative of at least one of an attitude of the mobile telephone, a velocity of the mobile telephone, and an acceleration of the mobile telephone. 